Apparatus for coating objects with subdivided material.



G. L. CRAGG. APPARATUS FOR COMING OBJECTS WITH SUBDIVIDED MATERIAL.

APPLICATION FILED 0013.24, 1910.

Patented Apr. 11, 1911;

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. powder to all exposed surfaces ot the object 4in'addition to thesurfaces directly facingr vuted over an area substantially coextensiveto the largest surface that maybe exposed citizen of the United States,residingr at of which the following is a full, clear, con- -ing a partof this specification.

4coating objects 'with comminuted, subdilish a. closed local. path orcircuit, which is The powder is admitted tothe flowing;

caused to leave the receptacle through ya GEoRGmL Omoo, `orCHICAGQILLINOIS, AssIGNoR ro BRADLEY 'AN:n \noom4mr '1 COMPANY; 03FCHICAGO, ILLINOIS,

I APPARATUS Fon concerns oBJEcTs WITH SUBDIVIDED lMarsratti;"" Y i .t ,fi-www1' To all 'it maycofnccn-j Be it known -thaft'L- GEORGE L. CRAGG,

Chicago,"in the county of 4Cook and btate of Illinois= have invented acertain new andu'seful Improvement in Apparatus for Coating Objects withSubdivided Material,`

oise, and exact description, reference being had to the accompanyingdrawings` form- My invention relates 4to apparatus for videdor powderedmaterial and is of particular service in spreading bronze powder sivematerial or paint which in its fresh state holds the vpowder scatteredthereupon and in itsdry state firmly fixes the powder in place- InpracticingJ my invention, l employ a7 receptacle for containing the`object that is to be coated with. the powderedmaterial, a .fan or blowerfor eiiecting forced circulation of air lthrough the receptacle, andlpiping which desirably includes the blower and receptacle in serial'relation to estab- Specification of Letteis'latent. 'Application filedOctober 24,

preferred, for the circulating air, though I do not wish to be limitedto this'way of practicing my invention,

air preferably through the piping. As my invention is preferablypracticed, the air is preferablyV drawn in from'the exterior of thereceptacle and is blasted through a blast pipe section,V a section 'ofthe aforesaid piping, which has that end which directly .communicateswith. the receptacle vinterior changeable in position to enlise thepowder laden air to swirl and thereby carry the the air entrance., The'air is desirably plurality of exit openings that are distribwith thelargest area to .be coated with the' powder. to insure the access of thepowder thereto. In thepreferredembodiment ot'- my invention, theaggregate area of .the air the air exit side of the receptacle to apowerexit openings does not exceed the area in right cross section of thepiping conveyingr y the airy from the receptacle, so that the I Patentedi910. semiaaasraa powder laden air is'forced,` toi4 seek. all that spacewithin the receptaclejfwhereh'theal jects to be coated withpowderperei'prop rly located. .'In the preferred-.embodiment of myinventiom-A the exitg openings Aar'elafforded by 'means p plate locatedin front 'of the exit portionof the pipe and in which screen theopenings.

are distributed over. the'desiredarea. p t

I will explain my invention `moreffully Aby reference-to theaocompanyingdraiwing showing the preferred and in which- .Figure 1 is anelevationipartlywn, section, of such preferredenibodiirientf 2 is a.,sectional view 'in the* direction of arrows 2 2 in Fig. l'and 3ds asec-4 .embiimaleeref tional'view in the directioniof arrows iinl4`ig.1.` H Like parts are indicated bynsimilarjharactors of referencethroughout the different figures. I

lof a screen-or :perforated f The receptacle@ is shaped 'su'itabl Fftbthel objects to be received thereiny' thec instruction illustrated beingwelladapted'to receive metal bedstead partsthat are moved 'iso into andout ofthe receptacle"uponatruck b through a `doorway c, abedsteaddpart'd.

boing-illustrated within the receptacle; The

door way' constitutes an openingthrough which the objects tobe coatedmaybe passed into the` receptacle interior in position l'to enable theair to be circulated'around and i 904 towardv the objectsand the door cconst-it-utes a closure for Said.openingifor'f.pre-A venting escape ofmaterial laden vair-therethrough while the objects are being coated. Asection e of suitable piping Ieadsifrom 111 `will move aboutthe'centero'f the other through an upright. conduit V A:tot

end of said pipe teiminal. "In other words p the discharge end h1 iseccentric with'respect desirably causedby iinparting a rotaryv movementtothe terminal 'about anaxis" that includes ,thexcenter of the pipe1andcoinpanion to the enditl/and' whereby, as the air lis blastedinto-the recepta'lclethe` paths or directions it followsv swirl' and'thereby lare "'alte'red thoroughly to distribute the air throughout'the interior fgf the' receptacle and lin a manner tocause 1t toreachall exposed portions ofthe article- ;O .be `coated. the powder `findinglodginenty net on'ly uponl those adhesively'c'oated sur-,jfav'ce'jportionsof the object' or vstructure d are immediately infront ofthe opening," but also.; 'upon 'all other exposedadhesivelylcoated surfaces of-said object as well'1nclud1ng those atthetop, bottom,

.lends and backs of said object.

seeking paths of least resistance.

lage of air where tionthrough the portion z 'The deected ppe section hissecured` at j its outer end to a wheel h2 that issecuredto its hubs bymeans of spokes that are widely separated for therethrough, beingincluded in the Yexternal circuit for `conveying the air to and from thereceptacle interior. The wheel h2 co-aXial with' the pipel thereto'andthe shaft h3 that is driven by a belt h4 through gearing 71,5 to rotatethe pipe yterminal L for the purpose which has been described. 'Astuffing box hsprevents leakthe shaft passes through the piping.-Further to insure the carriage o f the powder'to all surfaces uponwhich. it. is to be lodged and to improve the swirling for this .purposeI also multiple the air exit openings anddistribute them oyer'an areathat preferably exceeds the largest exposed surface upon the structure"d that is to receive the powder. These mult-ipled air vexit ordischarge openings are desirably constituted of the perforations p in ascreen plate g preferably constituting a wallv of the receptacle' a.AThe aggregate `area of these screen openings is preferably area of aright cross secof the pipe e that is uniform in diameter, the escapingair passing through all of the openings p in The end of the pipe.section e'adjacent to the screen 'Q flares toward said. screen andembraces its not greater than the -A borders.

- tacle more than a 'required to coat it 'of the p ipe disj j ing airthrough j the 'pipe end h1, is eccentric. 'In'this way'the discharge end'y 411.1 is ,caused-'to travel in aicircle or .-orbit,

the passage of. blasted air' the space between these spokes Aisconcentric or j end directly securedv The structure (l may remain in therecep-A esame adhesive Vmaterial will only hold what'.l

powder is properly required to coat .the structure. The powder that doesnot adhere to the structure d `continues to circulate through theclosedair circuit which has been 'described as long as the fan or-bloweris forcthe receptacle," and the amount lwhich becomes lodged upon saidstructure is replenished at I In order lto prevent the powder laden airfrom escaping at the door to the recep-- tacle whenarticlesare insertedywithin and withdrawn from the receptacle without stoppingthe operation`ofthe fan or blower, I "discontinue the path .for the flowing airpreferably by cutting off communication .between t-he blower 'and thepipe section gas by means ofla'l valve g1.

I have herein lshown scribed the preferred embodiment of my' invention',to which, however, be limited. l I l Having thus 'described myinvention, I claim as new anddesi-re'to secure by Letters Patent'thefollowing 1. vApparatus for coating objects with subdivided materialcarried vby air, including. a receptacle for the objects; a pipingsection whose bore is in communication withthe receptacle interior;means for effecting.'

forced passage of air through -the bore of said pipe section; and meansfor permitting movement of said pipe section wherebyA Ido not wishto ls'( and particularly detheair within the receptacle is .caused ltochange its direction and thereby carry the material withwliich it isladen to variousv parts of the object to be coated therewith, therebeing a plurality of openings affording communication between thereceptacle interior and exterior and located to have the object to becoated placed between the same and the aforesaid pipe section,

2; Apparatus subdivided material carried by air, including a receptaclefor the objects; a pipe section whose bore is in communication with thereceptacle interior; means for effecting forced passage of air throughthe bore of said pipe section; and means 4for permitting movement ofsaid pipeseetion whereby the air within the receptacle is caused tochange its direction-and thereby carry the material with which it isladen to various parts of GEORGE L.l cimes.l

lVitnesses Guo. C. DAvisoN n ETTAL. IVHITE.

for coating objects with

